Innlegg i Feilsøking &gt; Freeze for few seconds middle of printing

I was using the old 3.xx version without any issues for a long time. Today, I have updated to version 4.0, and noticed my printer is freezing for few seconds (couple of times in a print), and continues normally, but this causes melting on object where hot end pause.

I haven't changed anything. My printer is Robo3D R1+ without modifications.Does anyone have same issue? If not, I will do a clean installation.